Question

The state test scores for 12 randomly selected high school seniors are shown on the right. Complete parts​ (a) through​ (c) below. Assume the population is normally distributed.

1425 1227 989
697 729 839
729 742 550
626 1449 941 ​

find the sample mean. X overbarequals nothing ​(round to one decimal place as​ needed.

Answer 1

To find the sample mean of the test scores for 12 high school seniors, add all the scores and divide the sum by 12, which gives a sample mean of approximately 903.6.

Step-by-step explanation:

The student is asking for help in calculating the sample mean of the state test scores for 12 high school seniors. The sample mean is found by adding all the scores together and dividing by the number of scores. To perform this calculation:

1. Add all the given scores: 1425 + 1227 + 989 + 697 + 729 + 839 + 729 + 742 + 550 + 626 + 1449 + 941 = 10843.
2. Divide the total by the number of scores: 10843 / 12 = 903.58.

The sample mean is therefore approximately 903.6 (rounded to one decimal place as needed).